Kellogg’s opened a pop-up tweet shop in London to promote its new Special K Cracker Crisps. Instead of selling the product, it has been giving them away in exchange for positive tweets about it.

UK events agency Slice came up with the idea for the shop. Visitors can choose from one of three tweets from the menu on the wall to send to their followers or they can come up with their own, adding the hashtag #tweetshop. In return they get a free sample of the savoury snack.